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[quk@sievers.com (Phil Payne)]

In message <970509094128_1887364421@emout03.mail.aol.com> QSHIPQ@aol.com writes:

> The air flap is drawn open by vacuum, ...

No, it's forced open by flow.  The chamber into which it moves is very 
carefully shaped - in effect, it defines the mechanical enrichment curve.

The problem comes with density - if the air moving past the plate is more dense 
than the curve (chamber shape) was designed for, you will mis-align the 
fuel/air volume curves.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club